Introduction to Animals Worksheet
Circle the correct response.
1. Animals are [ heterotrophs / autotrophs ]
2. [ All / Most ] animals are multicellular.
3. The cells in the skin of your hand are [ bigger than / the same size as ] the cells in your
heart.
4. Organisms that have 2 copies of each chromosome are [mobile / diploid ]
5. The absence of a cell wall allows animals [ mobility / diploidy ]
6. A hollow ball of cells that forms after fertilization is called a [ blastula / mesoderm ]
7. In all animals except [ humans / sponges ] a zygote undergoes divisions to become a
blastula.
8. The cells of animals are organized into functional units called [ blastula / tissues ]
Matching:
9. ______ Ectoderm
a. lining of the digestive tract, digestive organs
10. ______ Mesoderm
b. outer layer of skin and sense organs
11. ______ Endoderm
12. ______ radial
c. most of the skeleton, muscles Match the body
plan to its description
d. body that is irregular shaped
13. ______ bilateral
e. has a distinct right and left half
14. ______asymmetry
f. body parts arranged around a central axis, like the
spokes of a bicycle wheel
What symmetry do these animals have?
15. ______________
16. ____________________
17. Segmented animals are constructed from a series of repeating units called [segments
/vertebrates]
18. Evidence of segmentation in human beings can be seen in the [ skin / backbone ]
Match the name of the Phylum to the organism:
a. vertebrates
19. _____ Cnidaria
b. segmented worms
20. ______ Mollusca
c. flatworms
21. _____ Annelida
d. jellyfish
22. _____ Chordata
e. sea stars
23. ______Nematoda
f. sponges
24. ______Platyhelminthes
g. clams
25. ______ Porifera
h. roundworms
26. ______Arthopoda
i. insects
27. ______Echinodermata
Animal Body Systems
For each term below, indicate what body system it relates to. Body Systems
28. Gastrovascular Cavity ___________________________
29. Ganglia ____________________________
30. Hermaphrodite ____________________________
31. Blood vessels ____________________________
32. Exoskeleton ____________________________
33. Gills
____________________________
34. Anus
____________________________
35. Nerve Net ____________________________
36. Hydrostatic ____________________________
37. Gametes ____________________________
38. Flame cells
____________________________
39. radula
____________________________
40. trachea & spiracles
___________________________
Revised from : www.biologycorner.com
Circulatory
Excretory
Reproductive
Support (skeletal)
Nervous
Respiration
Digestive